Relatively little is known about the dynamics of tropical urban forests, their phylogenetic diversity, as well as the socioeconomic and ecological factors that influence overall diversity across the urban landscape. However, permanent forest inventory and monitoring plot networks are increasingly being established across forests and cities of the world to monitor structural and functional attributes of urban forests, as well as ecosystem services. We analyzed a tropical, coastal urban forest in San Juan, Puerto Rico using metrics of phylogenetic diversity (PD), plant diversity, and available permanent plot data from an urban forest inventory and monitoring system. In total, we found 152 species belonging to 119 genera and 44 families in San Juan. PD tended to be highest in forest remnant areas. We also explored correlations between socioeconomic factors and taxonomic diversity and found that plant species richness was correlated with population density and housing price. We found marginally significant relationships between housing price, population density, and several PD metrics. Our results further suggest mixed evidence of luxury and legacy effects, two factors that have been linked to the plant diversity of anthropogenic ecosystems in other research. Overall, despite centuries of human influence, the existing urban forest diversity in San Juan - although perhaps not the particular species composition - is likely to be primarily the result of climate, biome, and multi-scale socioeconomic contexts and not legacy effects. The approach used and findings from this study could be used to better understand the application of PD metrics for assessing urban biodiversity and other beneficial attributes and traits of urban forests.

对于热带城市森林的动态，其系统发育多样性以及影响整个城市景观整体多样性的社会经济和生态因素知之甚少。但是，越来越多的世界各地森林和城市都建立了永久性森林清单和监测地块网络，以监测城市森林的结构和功能属性以及生态系统服务。我们使用系统发育多样性（PD），植物多样性以及城市森林资源清查和监测系统中的可用永久性地块数据，对波多黎各圣胡安的热带沿海城市森林进行了分析。总共，我们在圣胡安发现119个属152种和44个科。在森林残留地区，PD最高。我们还探索了社会经济因素与分类学多样性之间的相关性，发现植物物种丰富度与人口密度和房价相关。我们发现房价，人口密度和多个PD指标之间的关系微乎其微。我们的研究结果进一步表明，在其他研究中，奢侈和遗留效应是混杂的证据，这是与人为生态系统的植物多样性相关的两个因素。总体而言，尽管受到人类几个世纪的影响，圣胡安现有的城市森林多样性（尽管可能不是特定的物种组成）可能主要是气候，生物群落和多尺度社会经济背景的结果，而不是遗留影响。